can't access login.live.com on any browser (except Tor)

[SHODAN2114]

I'm seeing a blank page when I try to visit https://login.live.com/
It's not working in Chrome, Firefox or IE, but it does work in Tor browser. I'm using a Windows 7 PC which is connected via Ethernet.
I can view https://login.live.com/ on my Windows 8 laptop which is connected via WiFi. this works using any browser on my laptop.
on my PC, I can't sign-in to any Microsoft website or application.
I open OneNote and it shows me the sign-in screen: http://i.imgur.com/57IdVso.png
I enter my Microsoft email address and click 'Next', then the log-in box goes completely blank: http://i.imgur.com/S1BQ5nK.png
I tried flushing my DNS settings. my IPv4/6 properties are set to obtain an IP address automatically. In fiddler it says: "DNS Lookup for "auth.gfx.ms" failed."
no other websites are blocked, just Microsoft's log-in pages. the most annoying thing is that the Microsoft help forums require you to sign-in to your Microsoft account. can't get technical support over the phone because that is a paid service. any ideas?

 

[randomwin7user]

my best guess is that it's being blocked for some reason, this happened to me before and I could never fix it, but I would try changing your IP address and see if that fixes it How do I change my IP address?